
Basically yes...
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Kasei is socially inept and quite awkward but he is a good boy at least better than his brother. They liked one another before Itsuki knew he was an Omega. Everything they did was consensual (except the first kiss).
The brother's story is still incomplete. The last chapter was one of Ujou's friends in a party drugging Yohira and getting him gang-raped. Ujou finds them, gets angry, punches the wall, but joins in and thus drives the others away. He tells Yohira that (you aren't special but never let go of or disappear from my side) Yohira was originally someone whok served Ujou's father? Not sure of this part though. The father had an accident in chap 1. Ujou justified his anger that ppl trespassing on his property & territory is wrong not because he likes Yohira... His head is far away up his ass i have to say.
Actually this one is dorky and cute. The servant and the master (i am not good with remembering names) will start a relationship before the servant knows he is an Omega.
spoilers:
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first the master kind of notice the smell and it escalates because the brother is watching or something... He doesn't want his brother to take the servant away from him. Everything goes fairly well, on chapter 3 the servant falls from a ladder and they is nursed to health by the master. The Alpha is new to such situations so he is quite awkward.
moving forward, on chapter 4 the butler talks to him and takes him to the hospital according to the brother's orders. It is found that he is an Omega, the butler thereafter offers him money so he can flee and disappear, but he runs away without a word.
The master goes to search for him after knowing what had happened and saves him in return before he was raped in a back alley and then it ends with them becoming a bonded pair. His brother does not like omegas because they are inferior and a liability. He views him as the pinnacle of society so they should submit without getting anything in return. The sequel is on the brother's story. I still haven't bought all the chapters though.